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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925b0ddd98db532bfb655bfe198693e7fb59c0302df1dbb5b7ccd676f3864889' 
  AND token = '6aOGl4+HjY4DRv++4lakfjBGwGeDAiA5i+7qNKXmubI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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