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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ccc5665d64f36497e28c79b4f3b6d2ec326e9c3c85ef6cc4220db21429842b' 
  AND token = 'fLZcKatGgGL8T+yJ2bagoPHU0z9m6cncbre3967sO00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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