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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fae9da156423d79472bbcd35b6bc881a4ee8c95fe711b213388d1f5194da84' 
  AND token = 'FQV3HSy/4eomtcWvcuiQY4R/wjSsSbH8/IzFtup+yJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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