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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec74ef4162c046b5c890104cdf8b6cd0b16273d166e79e390122bc6e7df7ed8' 
  AND token = 'NLXDG7aRiAKTl9qOEbf8JZijxGMLl1/7GS1KBtNWsXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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