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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911da7add508445c93930e72ee11ded9828f3cfd3fd476bb4ffb7a57c17dc990' 
  AND token = 'mqKjw4wwaYHZGU/OLibpw8xelJg9eo37h0ugHd5Ck4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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