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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2525256783f778ca608caae6f9296cb5606407e12ee6b03052e31af7bd9d6e9a' 
  AND token = 'N94CL7VuWfqY/0Qu9cQeXyyx2yqsrNwn+yl4cbf/xbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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