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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419dd924384e5ca1e1790511ba5f01796c514a5507c980b9e3334dd7f5cad22a' 
  AND token = '6/zzfTaewW90YfcDfPvmwIrhRRzrvsBfB48Ii2sX81M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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