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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d012bcc6a1c20ea2f290f8bec87fccb7b8ddfa2c72a2446af5765673fe579b' 
  AND token = 'Ce2VxFcTR6l+WbSH7Y2cTYmbR8sOV9nXI+ICIy6sl+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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