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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2d24135f8ee8d4639df246efc694e24b94e737f22ea5d629d2e5751d63ebc6' 
  AND token = 'YpKtdzNZfIsjccZ9EcUIXLSNrSAYO3DgtKHXy7tM8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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