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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9c851e06cd5f5ad59e7fbcdd009ef7aaeb0c56fc6c0f8ed54c7d25cbdd864d' 
  AND token = 'JRNweNSd787YXOkwWSW8zzD9DtS98hgDzO1RhyA7ay8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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