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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927955e7908783d0575a24f4eb2c400e69644ec7f91725e9299699ca42b0ba40' 
  AND token = 'gjjGID6eHQBIwdpKCtmQ31WOJ01r3QoSvM0xv/J1LR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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