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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339f93b0f061aba75cb59ec4ca81c4d9950b29fb52e34c1582d7b832f86e5156' 
  AND token = '78GXWPxksK7Sia8AeABgGJ6P4iv+Pwu88Op7Bcla9Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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