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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921d9c96aa9775c1cd4dc0d12a9dc72fabbfe8acb43d7dbecb12394f93a10596' 
  AND token = 'sIHHw6ya4SuvAdtinb+9uvaELEWuffjgu4tHpxuNV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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