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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260c91d4a645bc4de1fda3c40d56368fb5a2ae1add12baf9d70bc38d1cfd0f96' 
  AND token = '8OhR3yBos0eeWq8WvcLysEsOd1tAwsFmYdUVN8il32g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}