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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c5e936cde37ad2dea93c24c0c3681d2f8844e093becd0b0632cd552764fa5' 
  AND token = 'abJyy68bGN6NGK+8WEVAZuVY+E+3aUeL/nNWnYK0MiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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