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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e5af8e91977acac8c7a5996eaa26e11bff94acd4bd976fb2b657453a2f23e' 
  AND token = 'KOBn9QPa6uC92qEOZnEyGBdOs4BPX9W5Kv67c/byYaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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