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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdb84e03baeb10f88652e1acf4fdd21cfcb6dbbad3984e37fde946f67ace332' 
  AND token = 'j8Ptx3axh/1xLHqqedmdllA1lDm74K/VdO0/ugna6uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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