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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a73ed01661a9f7a94e679a228217c448539216e8231c19e230dc21fc18d6cfe' 
  AND token = 'NQT3EfUSV4Lph/iqDN57w+XbudrjUkm1wqCSpyxLeOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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