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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2e0d119f015882ffaa7782b7bb218cb9e0969c299675817496b37ab2106a22' 
  AND token = 'k1cc4pPBA0dBY6v524Mm9c/cYAiVidJ1wvak0MrECfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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