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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a045ca08f411c476e07d9f65031fc079e46f497558f837d0011e98a1bd014db' 
  AND token = 'J2FaIQVL8XwpJ11kYLfIRY8s1i67Iv+vO+9WkmmENO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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