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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7ac0ad1db9188ebcb10d16c1f1f842517d5aa47e9da8e5ec1b14a8d8547111' 
  AND token = 'dn+RjUaEV/SeME45LtnVTgZDqBJFiTRfmOEZIU9aPvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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