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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bd17264dffa0d7c2013f67d66ae30257bea5e4d495c41a4454cda6fa8bbe6f' 
  AND token = 'y2UAL23LbR5sN79Qv5/11xb3/8owjjxAZaJcYApPqBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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