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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e5bb937450ac660a00d2dd129aa0acf2f2e443c8a5f99000ac14830744e780' 
  AND token = '30EmonoIYz20EKIufYb1LESHeZ7734N2nkWRm0oXRz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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