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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1235f15c6715c6a6d62f728fe243055a7eef6457fe095cbc4d0bb3f5beea6d' 
  AND token = 'YVc6UrsrbJlbyLMFAxVukzddsarvnmo075XinwQUneE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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