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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3285e197f864e81337820e7a78595faa839f6753e34ea48f28ca92f84ceb065c' 
  AND token = 'LGm1K0q/v8VVxRXf35PCnBv8A6csI5OiA+VZHfIkyII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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