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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325624c9c66af28e0460eb9d0be692bdc17db0dd8bf3697cbf26a0d0f2aa1ad8' 
  AND token = '6QMPbqmJHv9AjQ/r0yStyWq2OyWX/qywQQRwxTLZHMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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