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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8704825b2cf5ddc1cac73565c31d2d514332ad7ce8d7d6386c98dde62b78ed1a' 
  AND token = 'lD53gZ+Z+lwB7MAoMzwrbY9AJRYMYvdqanc63bSwDWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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