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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69326fb066de7909ce5d707f36d803a7409f50d356c2a1b5a3a50209823cf959' 
  AND token = '2g39Fi5Z2xjVQXrjIjIAKA57N0Fawhpq5GrgnJlhlQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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