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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422a3e5a5b6ce31cd260f3f498705ead0c3e9f4a1a1fcaf3e6e5ae6124d60bbd' 
  AND token = 'ycTlp5IUBpUIicE/d6DnB2c9+U2vkHz1di8UcBqfvhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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