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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68f54db25da350cb5b26853e266c46b4a2f3b95c8c0678b5b1baa4ce60c5f9a' 
  AND token = 'x3aJAbRR3u8VEpvhWSBU/zmbTPfZBA0jxQCpJe2S/5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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