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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b082ce0f1ac19788572c2b6c1978a396724b6ed5bb8cd8e09a7bfe38594758' 
  AND token = 'I5kky/Rx1NmvvqI6Ewz0AeQ0YWVk8MwwNhttFvJMiXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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