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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1134161e1394d42b483e2f2c020e5a11e49f421ada20702c814b2283e4da6f' 
  AND token = 'wHaNCNxxCxuN249cWQngBiH4uwU0T1Es4vYQMz6Oh/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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