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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83f2f1f8ad80bbabd29fb601b501a90bf346cef2f445a51f8d41794f8c9e98c' 
  AND token = 'd2o5jj0B4q0vVp1f7qMehhiPNXxzVGoO4tOM/es25io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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