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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a57d98f34793bd97e881061932857e91002e57ad21ff6df699076169cd30aa' 
  AND token = 'WOFZryu0aVTYV1ykm/KY6AqJ/sLIFEdZhNpMQZFl5B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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