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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e966f03d5142ee1036c975cf892317199bdd4ed7b83a4da92d597bd559a5b49' 
  AND token = 'kTDGZC04uhaan6se8J0/K67sk4LxVw8lvaWMHc9OCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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