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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07c5d5c7d60cbed88fd9be740edf1132c5593b569672d71ccfe8630e0821ebf' 
  AND token = 'SoQHC2KwwR+Y7Iymlv50UlWyXPaVi74Kit4PgViGjcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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