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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9a8033aa329ffed926a3e6c1c86b6ef19ac306e90a2bdbfd661c7222f82742' 
  AND token = 'qk4ZXT+mCY9CMTY8gRVYyoxUdT4YZnelxzLYqrKobK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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