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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4690cd6bf114d236aa4eef7a0dd92ecf3812425bcd3d3f99b39d8ae1d9fee38d' 
  AND token = 'sL9ldjzSrPrAUBZxF+X7E6olk5EN/8lWuAS3E0bZAdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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