SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7514a6ba5c1df2c5c7814d3727bf679af1beee345a2125974176f3ea97931006' 
  AND token = 'VNJAPGDTnqv4mQD8TrCzUyVp9srA2sQSKGZmjdmQ6Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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