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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a593c33ae7dbea918406b2cf0029e223910ebb940ebffa76fab442e845cb2bde' 
  AND token = 'o6v0FdPicg+Oj4ckALlWju2Nwj9OuzlpRZTTV3O2E94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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