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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b28cb2f302154210502d03dd88cf285a3c3f9a904847d141f458373a7651d44' 
  AND token = '9giQ0Q5jV7kTTgpsCIs6KkBrZy3HZT50bS9Yf/uyEGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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