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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9fceb946ede74afe8a01332218dd9ac72276ad29690c28c402e5895a787f3d' 
  AND token = 'dwS/lg/pMrEPj9iGtcQqLI8rbaC+QE0j5HyM7+KUT8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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