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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59a39cef0a7b3e2e67aea4b1699133cda29adebd9a8a48ebe6d2a720dbd1135' 
  AND token = 'YVH/8skOxxLGP1igiZSyQiWnc+vs3gTFsE/95ub2lJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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