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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c1db0ed0cc1477b775a65e1886b6d4260e3e841539ce1cc6845b2f7161cac3' 
  AND token = '0jjHlN7SKeoBcTLZ4iJa9Ijw1Az9w7I6YkZSN03QD6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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