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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71eaf8b1fa760f77c9fd4ccf845a24815347dc2a5c55e124ddf1dbdff6e5604' 
  AND token = 'KEErpkNnA0Ky7XiDxhOWhPLbNPtr4XzDizfak5LrwBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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