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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe1f08c11265d54c5dd48b46e861962dfb0eaf2b26904a52ae4fb379e5ba8c8' 
  AND token = 'U0TbGc9/yu3uYvYOgA9JHA7Nb0qtZgMdEaJPnkEOcDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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