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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf49c4f27a2888dec6b1c91007d7eb802355e61ffa9858cf2f41699557b019b' 
  AND token = '0DN9Q2zADlEfPwoCE/w3MDsYwhq3OLEw7O3dI3GFPEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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