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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd838d34e90df019060b721afd6587ea9f5b050ec55a71eb49d6e17d0dc05840e' 
  AND token = 'qJa9GniVXafaV0x5N51ALkxi7yeS2mCIUCYtElskqNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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