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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9233503798a7f8361ea6dc9e2d027358b2885245bb92138b25d31463d39ee33' 
  AND token = 'GGGOuqPtgdldoY0B/z0hoHrEHs3Vdu+Jq/o6/5xN6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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