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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99517037c11f15e0852b3d01c828d3f0d74b09a8c6622b4fab7d763b5847c821' 
  AND token = 'uyocObXXcmwh3gbggkhtuqF5qwnovrgXmzc6HIAHiW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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