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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc11b90237ef67eb360e7b25fa83f5afd1a786b697afe4f31179fe1130e0ad7c' 
  AND token = '5GWEkK6x50fNrTP19xmvLjc2T3351ZBsoEaMi30yBNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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