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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0811d687b8bda47607a13fc57ca92d72d659b7647599f8256beaf938a8b59f' 
  AND token = 'RP7p9JbadXd7PPeN/cofGCKR6jrf5iiAetPQ/DEj7cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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