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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517f3f9181cc4e3d408771dccd6c29a939463ccccad534a84d120a35c4e86604' 
  AND token = 'Cd2ma0CiD7tgler+I/mocvgfth+qmhfXP7tGdAnHaFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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