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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0b7ace94102fa6a4eb72e8775e835d84677c93c0cb38368d99ef3313fc4c2' 
  AND token = '9z2JMdfEDG5/+4y/qj0hmkcxiKDPIfN3wdA5Begh9Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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