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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0585b43d7868be1055e029099f8b6c16fa7b3ee27de945d1f9b09881b76ae75' 
  AND token = 'Cxem0dSZuLmfaz+H5U19R3IljyMWA6/N7GmnF8sTe0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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