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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35938cb5f8820951ab0d19e2150382e7ba48db3336922c8396c11def04a1e619' 
  AND token = '+Rbamw0qowr5pklkpxZbAK5/vt2xU8gOSiRVrzQ8PoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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