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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb9c34498fe4e10474ef4c0bb3c4bc9ba67ac4f8695f8cd57cc3e0cd2bae345' 
  AND token = 'HqDBrQheEYipl2MvyHmdbp0v0SnkGpmX719Wqax+0xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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